Iran on Thursday vowed a "crushing response" to any attack after US President Donald Trump warned time was running out for a nuclear deal, and as the European Union looks to declare the Revolutionary Guards a terrorist organisation. The face-off has sent diplomatic shock waves across the region, with calls for negotiations to defuse tensions drawing in key regional actors. However, Iran has warned of "destructive consequences" if the designation is greenlit, state media reported Tuesday. Advertisement AdvertisementAdvertisement AdvertisementThe United States had hit Iranian nuclear targets when it briefly joined Israel's war against Iran in June. Iran is ready to negotiate on the nuclear file again," Turkish Foreign Minister Hakan Fidan told Qatar-based Al-Jazeera television in English.